Choose the correct words to complete the sentence:
It was so cold that we couldn't go out.
Step 1: The phrase ``so...that" is used to indicate a result or consequence. In this sentence, the cold was so intense that the consequence was they couldn't go out.
Step 2: The other Option don't fit the context:
- ``Too...to" would mean something was excessively cold to the point of not being able to do something, but ``so...that" is the appropriate construction here.
- ``Neither...nor" and ``either...or" are used for negative or alternative conditions, which don't fit in this case.
Thus, the correct answer is option (A) so, that.
If the roots of the quadratic equation \( ax^2 + bx + c = 0 \) are real and equal, then: